Quote:
Originally Posted by ninjan00dles
I reached out to Neal @ Racer's Line who helped develop the CARB tune (I learned). He informed me that the Harrop kit uses a separate IAT sensor and the stock MAP sensor so it does not require a smoothie box.
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It depends on the tuner, what the tuner is using to do their tune and your setup. Some tuners prefer to tune off a MAP sensor, and I don't know the limits of the MAF sensor for tuning. Maybe it has no limits, but I bet there is a limit.
From what I understand, the Harrop kit uses the stock MAP sensor and is running a tune off the MAF readings. The stock MAP isn't really designed for boost, so anyone getting a tune based on the MAP sensor needs to upgrade, which was me, and because I am running more than the stock pulley, the entry level MAP sensor at 11psi wasn't enough, so I am on the 45psi sensor.
The downside is that the MAP sensor does see fluctuations, which I hear tell from others can be tuned out like Mike said, but I don't know if all ways of tuning it out is the same or equally safe or possible at all boost levels or whatever. Best thing is to find a tuner, and then ask them.